[wpilib] DriverStation: Add DataLog support for modes and joystick data

wpilibc/src/main/native/include/frc/DriverStation.h

@@ -9,6 +9,10 @@
 #include <units/time.h>
 #include <wpi/deprecated.h>
 
+namespace wpi::log {
+class DataLog;
+}  // namespace wpi::log
+
 namespace frc {
 
 /**
@@ -441,6 +445,14 @@ class DriverStation {
    */
   static bool IsJoystickConnectionWarningSilenced();
 
+  /**
+   * Starts logging DriverStation data to data log. Repeated calls are ignored.
+   *
+   * @param log data log
+   * @param logJoysticks if true, log joystick data
+   */
+  static void StartDataLog(wpi::log::DataLog& log, bool logJoysticks = true);
+
  private:
   DriverStation() = default;
 };